One other thing to note ask about regarding Lightning Lanes and split stays-- the booking window for LL would be 7 days before the first day of which ever hotel reservation your park tickets are attached to. Correct?
For most people, no big whoop, but if your park tickets are attached to your 2nd hotel reservation in a split stay, instead of the first hotel, the valid dates for the tickets start the check-in day of the 2nd reservation, and 7 days before that day is when your LL booking window opens. In this case, the days of the 1st hotel stay are completely uninvolved in LL booking.
Just noting since there are idiosyncrasies w/ split stays for LL booking also, it's not just a blanket ability to book for the whole stay if you have a weird one-off case like this. We set our reservations up this way purposefully since we're doing 3 hotels over 10 days, but only a 4-day park ticket and we wanted our tickets to be valid in the later part of our trip.